Eavesdropping is the intentional act of secretly listening in on a conversation, usually not for the best of intentions. Although today the act also includes VoIP telephone systems, it’s not a recent trend. As exemplified by the SIPtap attacks of 2007 and the Peskyspy trojans of 2009, cybercriminals have had their eye on VoIP ever since it was introduced to the market.

VoIP has become the ultimate communication tool for enterprises, but it has also become another vulnerability that hackers exploit. Because voice is essentially transferred as data, the risk of digitized messages being intercepted and heard by unauthorized ears increases.